forked from: Bitmap基本

/**
 * Copyright _wonder ( http://wonderfl.net/user/_wonder )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/wxEP
 */

// forked from _wonder's Bitmap基本
package {
    import flash.display.Sprite;
    import flash.display.BitmapData;
    import flash.display.Bitmap;
    import flash.events.Event;
    import flash.geom.Matrix;
    
    [SWF(width=465, height=465, backgroundColor=0)]
    public class myBitmap extends Sprite {
    	
    	   private var fig:Sprite;
    	   private var matrix:Matrix;
    	   private var bmd:BitmapData;
    	   
        public function myBitmap() {
            /* オブジェクトを作成 */
            fig = createCircle( 0, 0, 10, 0XCC0000 );
            
            /* ビットマップデータを作成 */
            bmd = new BitmapData( 465, 465, false, 0 );
            addChild( new Bitmap( bmd ) );
            
            /* matrixを作成 */
            matrix = new Matrix();
            
            addEventListener(Event.ENTER_FRAME, enterframe);
        }
        
        private function createCircle(cx:Number, cy:Number, size:Number, col:uint):Sprite {
            var sprite:Sprite = new Sprite();
            sprite.graphics.beginFill( col );
            sprite.graphics.drawCircle( cx, cy, size );
            sprite.graphics.endFill();
            return sprite;
        }
        
        private function enterframe(e:Event):void {
        	    matrix.identity();
        	    var num:Number = Math.random()*2;
        	    matrix.scale(num, num);
        	    matrix.translate(mouseX, mouseY);
        	    
        	    bmd.draw( fig, matrix );
        }
    }
}